<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"> Large number of mechanical and chemical surface pretreatment techniques is actually used on steels in industrial practice. Choosing the right combination of these technologies is one of the most important tasks for many applications. The purpose of this research was to evaluate the influence of selected mechanical surface preparation methods (grinding, sandblasting) on the quality and electrochemical corrosion characteristics of S355J2 steel before and after the final chemical surface treatment by the technology of manganese phosphating. The surface morphology of the formed phosphate layer was evaluated by a scanning electron microscopy (SEM) and the cross section analysis was performed by a light metallographic microscopy. 0.1M Na2SO4 solution simulating aggressive industrial pollution was selected for electrochemical corrosion tests. Impact evaluation of various mechanical and chemical surface treatments on the corrosion properties of the tested steel was realized by potentiodynamic polarization tests (PD) and electrochemical impedance spectroscopy (EIS) using the Tafel analysis and equivalent circuits method respectively. The obtained results proved that sandblasting negatively affected the corrosion resistance of S355J2 steel and subsequently created manganese phosphate layer.</abstract>

Large number of mechanical and chemical surface pretreatment techniques is actually used on steels in industrial practice. Choosing the right combination of these technologies is one of the most important tasks for many applications. The purpose of this research was to evaluate the influence of selected mechanical surface preparation methods (grinding, sandblasting) on the quality and electrochemical corrosion characteristics of S355J2 steel before and after the final chemical surface treatment by the technology of manganese phosphating. The surface morphology of the formed phosphate layer was evaluated by a scanning electron microscopy (SEM) and the cross section analysis was performed by a light metallographic microscopy. 0.1M Na2SO4 solution simulating aggressive industrial pollution was selected for electrochemical corrosion tests. Impact evaluation of various mechanical and chemical surface treatments on the corrosion properties of the tested steel was realized by potentiodynamic polarization tests (PD) and electrochemical impedance spectroscopy (EIS) using the Tafel analysis and equivalent circuits method respectively. The obtained results proved that sandblasting negatively affected the corrosion resistance of S355J2 steel and subsequently created manganese phosphate layer.

Electrochemical corrosion characteristics of phosphated S355J2 steel in sulfate environment

Výskumné centrum Žilinskej univerzity,

Žilinská univerzita v Žiline, Strojnícka fakulta, Katedra materiálového inžinierstva,

Ústav fyziky materiálů AV ČR v. v. i., Brno, Czechia

Vysoké učení technické v Brně, Fakulta chemická, Ústav materiálů, Czechia

Výskumné centrum Žilinskej univerzity, Czechia

Žilinská univerzita v Žiline, Strojnícka fakulta, Katedra materiálového inžinierstva, Czechia

Koroze a ochrana materiálu

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Large number of mechanical and chemical surface pretreatment techniques is actually used on steels in industrial practice. Choosing the right combination of...

Electrochemical corrosion characteristics of phosphated S355J2 steel in sulfate environment

Pubblicato online: 08 dic 2016

Pagine: 107 - 113

DOI: https://doi.org/10.1515/kom-2016-0017

© by F. Pastorek

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.